The Inogen Rove 4 Intermediate Battery powers your Inogen Rove 4 concentrator when you’re away from a power source to provide travel portability for your active lifestyle. G4 owners, don't feel left out, the BA-404 Intermediate Battery will also work on your existing Inogen One G4 Portable Oxygen Concentrator! The Intermediate battery will give you up to 4 hours, 15 minutes of battery life.* *on Flow Setting 1; Battery time varies with flow settings To save you money we are offering these Brand New units as New "Open Box" items. Upon ordering, you will NOT receive the original box for the battery. You will only receive the new battery. We do accept refunds and or exchanges and have excellent customer service. Better Hurry, supplies are EXTREMELY Limited! Sorry No International Shipping even if you are using a US Global mailing address